Prescribing practices of endocrine therapy for premenopausal breast cancer patients in Mexico oleh C. Villarreal-Garza, F. Mesa-Chavez, C. De la Garza-Ramos, A.S. Ferrigno, K. Villanueva-Tamez, A. Fonseca, J.Y. Campos-Salgado, D.O. Rodriguez-Gomez, S. Ruiz-Cruz, P. Cabrera-Galeana, M. Garcia-Garcia, M. Cruz-Ramos